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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '09763c0320c9fcfe54d9c87913f809e3c3709a17d1954c67f777856c1cab54e9' 
  AND token = 'ej5PKukUV/24LXcqgTSGXwpGxkeOJcf5Bwu5S6ju8rc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}